Affordance has so many meanings and shades of meaning that the word itself may be said to lack "affordance" because its use "affords" the user nothing if its meaning is not equally and identically understood by the audience.

Conclusion of SH on reading the Wikipaedia definition

Resource Owner

See Relying Party

Attribute

A piece of information related to an entity (SH addition) ... that is capable of independent (electronic) verification by a Relying Party or Identity Service Provider